Is liquid nitrogen freezing useful?

Cryopreservation with liquid nitrogen is a safe treatment method with few side effects, which is widely used in dermatology.

Principle: Liquid nitrogen freezing is a kind of physics commonly used in hospital dermatology and beauty salon. It uses low temperature to act on the diseased tissue-skin lesions, so as to make the diseased tissue necrosis and fall off, thus achieving the purpose of beauty.

Liquid nitrogen is used as a refrigerant for cryotherapy. It is a colorless, odorless and nonflammable transparent liquid with a temperature of about-196℃.

Objects of liquid nitrogen freezing: freckles, moles, pigmented spots, etc.

Methods: Freeze first, and then suddenly cool down, so that ice crystals are formed inside and outside the tissue cells, and the structure is destroyed and broken; At the same time, low temperature causes cell dehydration, electrolyte concentration, pH change, protein degeneration, cell metabolism and death, thus achieving the purpose of beauty.

Mechanism of freezing: In the process of freezing, freezing and melting of tissues and cells are the key factors leading to their damage.

Equipment: liquid nitrogen tank, liquid nitrogen cup and liquid nitrogen pen.

Liquid nitrogen refrigeration uses stainless steel with excellent quality as the main material. Based on the principle of phase change refrigeration, liquid nitrogen flows into the cold head from the liquid nitrogen tank through the infusion tube by using the pressure formed by evaporation of liquid nitrogen, thus achieving the freezing effect. The liquid nitrogen cup consists of six parts: a freezing head, an infusion tube (an elbow connected to the cover), a liquid nitrogen tank, a liquid nitrogen tank cover (the cover is connected to the infusion tube), an exhaust switch (a white protruding part on the cover) and a handle.

The methods of liquid nitrogen freezing include cotton swab method, contact method and spray method.